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Gene-by-Smoking Interactions and Risk of Atherosclerosis - Ancillary to ARIC

This study has been completed.
Sponsor:
ClinicalTrials.gov Identifier:
NCT00064545
First Posted: July 10, 2003
Last Update Posted: December 13, 2012
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Collaborator:
National Heart, Lung, and Blood Institute (NHLBI)
Information provided by (Responsible Party):
Kari North, PhD, University of North Carolina, Chapel Hill
  Purpose
To evaluate common genetic variations, that in combination with exposure to tobacco smoke, may modify the risk of atherosclerosis.

Condition
Atherosclerosis Cardiovascular Diseases Heart Diseases Coronary Disease Carotid Artery Diseases Peripheral Vascular Diseases Cerebral Arteriosclerosis Cerebrovascular Accident

Study Type: Observational
Study Design: Observational Model: Case Control

Resource links provided by NLM:


Further study details as provided by Kari North, PhD, University of North Carolina, Chapel Hill:

Primary Outcome Measures:
  • CHD [ Time Frame: Baseline - 2001 ]

Enrollment: 1500
Study Start Date: July 2003
Study Completion Date: June 2008
Primary Completion Date: June 2008 (Final data collection date for primary outcome measure)
Detailed Description:

BACKGROUND:

While cigarette smoking is a well-established and potent risk factor for atherosclerotic vascular disease, individual susceptibility to smoking varies considerably, suggesting modifiers such as genomic variation. Several key enzymes involved in the activation and detoxification of mutagenic tobacco smoke compounds, oxidative stress, and DNA damage are expressed in the tissues of the heart and vasculature and represent mechanistic pathways for tobacco-induced pathology. Many of these enzymes have common polymorphisms (greater than or equal too 10% prevalence in the population) with known functional effects. Although restricted to a few enzymes and hampered by shortcomings in design, a small number of studies have suggested that enzymatic activation and detoxification of tobacco smoke modifies the risk of certain cardiovascular outcomes associated with cigarette smoking.

DESIGN NARRATIVE:

The genetic epidemiology study will evaluate common genetic polymorphisms that, in combination with exposure to tobacco smoke, may modify the risk of atherosclerosis and its clinical sequelae. An average of six polymorphisms, selected on the basis of their prevalence and functional significance, expression in relevant tissues, evaluation in previous studies and biologic plausibility, within 19 genes involved in activation, detoxification, oxidative stress, and DNA repair pathways will be evaluated as an ancillary study to the Atherosclerosis Risk in Communities (ARIC) study. In this well-characterized, bi-ethnic cohort of 15,792 men and women under active follow-up since 1987-89 (completeness of follow-up 96%), five endpoints quantifying subclinical atherosclerosis and validated clinical atherosclerotic events will be studied in case-cohort/case-control mode: incident coronary heart disease, carotid atherosclerosis, peripheral arterial disease, incident stroke, and MRI-detected cerebral infarcts. The study is well designed to study how DNA sequence polymorphisms can promote or inhibit the atherogenic effects of smoking and the risk of clinical events, and to contribute new knowledge on the role of genetic variation in the response to environmental insults and toxicants.

A case-cohort or case-control approach will be taken, using data from the Atherosclerosis Risk in Communities (ARIC) study. Approximately 20 polymorphisms will be examined in relation to five cardiovascular disease (CVD) endpoints. The polymorphisms to be examined are classified as variants of either a) Phase I (activation) enzymes, b) Phase II (detoxification) enzymes, c) oxidative stress enzymes, or d) DNA repair enzymes. The CVD endpoints include incident coronary heart disease (CHD) cases (n=1,101), incident stroke cases (n=323), prevalent peripheral artery disease (PAD) (n=237 cases), carotid atherosclerosis determined by MRI (n=504 cases), and cerebral infarcts (n=237cases). Controls will consist of 1,062 controls selected at visit 1, and 237 visit-3 controls for the cerebral infarct cases. The statistical approach will be based on the proportional hazards regression for incident CHD and stroke endpoints, and logistic regression for the other CVD outcomes. Both additive and multiplicative forms of interaction will be tested.

  Eligibility

Information from the National Library of Medicine

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Ages Eligible for Study:   Child, Adult, Senior
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
ARIC cohort, incident cases of CHD and cohort representative sample.
Criteria
No eligibility criteria
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00064545


Sponsors and Collaborators
University of North Carolina, Chapel Hill
National Heart, Lung, and Blood Institute (NHLBI)
Investigators
Principal Investigator: Kari North University of North Carolina, Chapel Hill
  More Information

Responsible Party: Kari North, PhD, Associate Professor, University of North Carolina, Chapel Hill
ClinicalTrials.gov Identifier: NCT00064545     History of Changes
Other Study ID Numbers: 1227
5R01HL074377 ( U.S. NIH Grant/Contract )
First Submitted: July 8, 2003
First Posted: July 10, 2003
Last Update Posted: December 13, 2012
Last Verified: December 2012

Additional relevant MeSH terms:
Arteriosclerosis
Intracranial Arteriosclerosis
Brain Diseases
Cardiovascular Diseases
Heart Diseases
Atherosclerosis
Vascular Diseases
Coronary Disease
Coronary Artery Disease
Stroke
Peripheral Vascular Diseases
Peripheral Arterial Disease
Carotid Artery Diseases
Arterial Occlusive Diseases
Myocardial Ischemia
Cerebrovascular Disorders
Central Nervous System Diseases
Nervous System Diseases
Intracranial Arterial Diseases


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